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authorBen Dooks <ben-linux@fluff.org>2008-10-21 14:06:59 +0100
committerBen Dooks <ben-linux@fluff.org>2008-12-15 21:53:38 +0000
commit952b564b4d26964e3114d02368741e192e30ae28 (patch)
tree084dcb7af82e0b8a1e8c0ba38eef8249d4f6acc2 /arch/arm
parentaa64ea3f78496bcd7d72d5caffa3d0bf43e84e54 (diff)
[ARM] S3C64XX: Add PLL definitions
Add definitions for the s3c6400 epll and main pll as well as functions to decode the rate. Add Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/plat-s3c64xx/include/plat/pll.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c64xx/include/plat/pll.h b/arch/arm/plat-s3c64xx/include/plat/pll.h
new file mode 100644
index 00000000000..1a8576422f1
--- /dev/null
+++ b/arch/arm/plat-s3c64xx/include/plat/pll.h
@@ -0,0 +1,74 @@
+/* arch/arm/plat-s3c64xx/include/plat/pll.h
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ * http://armlinux.simtec.co.uk/
+ *
+ * S3C64XX PLL code
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#define S3C6400_PLL_MDIV_MASK ((1 << (25-16)) - 1)
+#define S3C6400_PLL_PDIV_MASK ((1 << (13-8)) - 1)
+#define S3C6400_PLL_SDIV_MASK ((1 << (2-0)) - 1)
+#define S3C6400_PLL_MDIV_SHIFT (16)
+#define S3C6400_PLL_PDIV_SHIFT (8)
+#define S3C6400_PLL_SDIV_SHIFT (0)
+
+#include <asm/div64.h>
+
+static inline unsigned long s3c6400_get_pll(unsigned long baseclk,
+ u32 pllcon)
+{
+ u32 mdiv, pdiv, sdiv;
+ u64 fvco = baseclk;
+
+ mdiv = (pllcon >> S3C6400_PLL_MDIV_SHIFT) & S3C6400_PLL_MDIV_MASK;
+ pdiv = (pllcon >> S3C6400_PLL_PDIV_SHIFT) & S3C6400_PLL_PDIV_MASK;
+ sdiv = (pllcon >> S3C6400_PLL_SDIV_SHIFT) & S3C6400_PLL_SDIV_MASK;
+
+ fvco *= mdiv;
+ do_div(fvco, (pdiv << sdiv));
+
+ return (unsigned long)fvco;
+}
+
+#define S3C6400_EPLL_MDIV_MASK ((1 << (23-16)) - 1)
+#define S3C6400_EPLL_PDIV_MASK ((1 << (13-8)) - 1)
+#define S3C6400_EPLL_SDIV_MASK ((1 << (2-0)) - 1)
+#define S3C6400_EPLL_MDIV_SHIFT (16)
+#define S3C6400_EPLL_PDIV_SHIFT (8)
+#define S3C6400_EPLL_SDIV_SHIFT (0)
+#define S3C6400_EPLL_KDIV_MASK (0xffff)
+
+static inline unsigned long s3c6400_get_epll(unsigned long baseclk)
+{
+ unsigned long result;
+ u32 epll0 = __raw_readl(S3C_EPLL_CON0);
+ u32 epll1 = __raw_readl(S3C_EPLL_CON1);
+ u32 mdiv, pdiv, sdiv, kdiv;
+ u64 tmp;
+
+ mdiv = (epll0 >> S3C6400_EPLL_MDIV_SHIFT) & S3C6400_EPLL_MDIV_MASK;
+ pdiv = (epll0 >> S3C6400_EPLL_PDIV_SHIFT) & S3C6400_EPLL_PDIV_MASK;
+ sdiv = (epll0 >> S3C6400_EPLL_SDIV_SHIFT) & S3C6400_EPLL_SDIV_MASK;
+ kdiv = epll1 & S3C6400_EPLL_KDIV_MASK;
+
+ /* We need to multiple baseclk by mdiv (the integer part) and kdiv
+ * which is in 2^16ths, so shift mdiv up (does not overflow) and
+ * add kdiv before multiplying. The use of tmp is to avoid any
+ * overflows before shifting bac down into result when multipling
+ * by the mdiv and kdiv pair.
+ */
+
+ tmp = baseclk;
+ tmp *= (mdiv << 16) + kdiv;
+ do_div(tmp, (pdiv << sdiv));
+ result = tmp >> 16;
+
+ return result;
+}